This is a multi-center, parallel group, placebo-controlled and active-compared, randomized study to assess the ability of GSK962040 to enhance the delivery of enteral feed to critically ill subjects that are predisposed to developing feeding intolerance (e.g., percentage of goal volume); enhance gastric emptying in this population; and provide preliminary evidence of the drug's effect on outcomes of therapy (length of stay in the Intensive Care Unit [ICU], time on ventilator, ICU acquired infections, and 60-day mortality). Other aims are evaluation of GSK962040 safety, tolerability and pharmacokinetics upon repeat dosing in a critically ill population.